SMA SC 500HE-US Maintenance Manual

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Central Inverter

SUNNY CENTRAL 500HE-US/CA

Maintenance Manual

SC500HEUS-eng-WH-IUS120411 | 98-4103011 | Version 1.1

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SMA America, LLC Legal Restrictions

or by any means, electronic, mechanical, photographic, magnetic or otherwise, without the prior written permission of SMA America,LLC.

Neither SMA America,LLC nor SMA Solar Technology Canada Inc. makes representations, express or implied, with respect to this documentation or any of the equipment and/or software it may describe, including (with no limitation) any implied warranties of utility, merchantability, or fitness for any particular purpose. All such warranties are expressly disclaimed. Neither SMA America,LLC nor its distributors or dealers nor SMA Solar Technology Canada Inc. nor its distributors or dealers shall be liable for any indirect, incidental, or consequential damages under any circumstances.

(The exclusion of implied warranties may not apply in all cases under some statutes, and thus the above exclusion may not apply.)

Specifications are subject to change without notice. Every attempt has been made to make this document complete, accurate and up-to-date. Readers are cautioned, however, that SMAAmerica,LLC and SMA Solar Technology Canada Inc. reserve the right to make changes without notice and shall not be responsible for any damages, including indirect, incidental or consequential damages, caused by reliance on the material presented, including, but not limited to, omissions, typographical errors, arithmetical errors or listing errors in the content material.

All trademarks are recognized even if these are not marked separately. Missing designations do not mean that a product or brand is not a registered trademark.

The Bluetooth

word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by SMA America,LLC and SMA Solar Technology Canada Inc. is under license.

SMA America, LLC

3801 N. Havana Street

Denver, CO 80239 U.S.A.

SMA Solar Technology Canada Inc.

2425 Matheson Blvd. E

8th Floor

Mississauga, ON L4W 5K5

Canada

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Important Safety Instructions SMA America, LLC

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IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS

This manual contains important instructions for the following products:

• Sunny Central 500HE-US/CA

This manual must be followed during installation and maintenance.

The product is designed and tested according to international safety requirements, but as with all electrical and electronic equipment, certain precautions must be observed when installing and/or operating the product. To reduce the risk of personal injury and to ensure the safe installation and operation of the product, you must carefully read and follow all instructions, cautions and warnings in this manual.

Warnings in this document

A warning describes a hazard to equipment or personnel. It calls attention to a procedure or practice, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the SMA equipment and/or other equipment connected to the SMA equipment or personal injury.

Symbol Description

DANGER indicates a hazardous situation which, if not avoided, will result in death or serious injury.

WARNING indicates a hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

NOTICE is used to address practices not related to personal injury.

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SMA America, LLC Important Safety Instructions

1 Notes on this Document

This manual describes the service and maintenance of the Sunny Central 500HE-US/CA.

Validity

This manual is valid for the Sunny Central 500HE-US/CA.

Target Audience

This manual is intended for qualified skilled workers. Only qualified personnel are allowed to perform the tasks described in this manual (see Section 2.2 "Target Audience Skills", page 10).

Additional Information

Additional information is available at www.SMA-America.com:

Title Document type

Sunny Central 500HE-US/CA - User Manual User manual

Sunny Central 500HE-US/CA - Installation Manual Installation manual

Installation Manual: Disconnect Unit Installation manual

Nomenclature

In this manual, the Sunny Central 500HE-US/CA is also referred to as the Sunny Central or the inverter.

In this manual, SMA America Production, LLC and SMA Solar Technology Canada Inc. are hereinafter referred to jointly as SMA.

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2 Safety SMA America, LLC

2Safety

This section describes general safety rules that must always be observed when working on and with the Sunny Central. Read this section in order to prevent personal injury and property damage and to ensure long-lasting operation of the Sunny Central.

2.1 Intended Use

The Sunny Central is an inverter that converts direct current generated in the PV modules into alternating current when the DC input voltage is in the 330 V to 600 V range, and when the permissible ambient conditions are adhered to. The alternating current that is generated is fed into the power distribution grid by a transformer that is connected in series. The Sunny Central is suitable for operation in outdoor areas. The Sunny Central meets NEMA 3R protection class standards and can also be operated in rain, snow, and sleet.

Only persons meeting all of the qualification standards for the target audience may work on or with the Sunny Central.

Intended use also includes observance of the service and maintenance intervals specified in this document.

All work on the Sunny Central must be performed with the appropriate tools. In order to ensure that the Sunny Central is used as intended, this documentation must be read and

all safety precautions and messages must be duly noted and followed. The Sunny Central may not be rebuilt or modified, and additional component parts may not be

installed without the express consent of SMA America, LLC. The Sunny Central may not be operated with its doors open. The Sunny Central may not be opened when it is raining or when humidity exceeds 95%. The Sunny Central may only be operated when it is in perfect working order. This must be ensured by

observance of the service and maintenance intervals specified in this document. In addition, the maintenance work that has been performed must be documented by the customer in the maintenance report and also with photos.

Any use of the Sunny Central other than what is described in this section is not regarded as intended use.

2.2 Target Audience Skills

A qualified skilled person has been adequately trained and has demonstrated the ability and knowledge to operate and maintain the device. A qualified skilled person has been trained in how to deal with the dangers and risks associated with installation of electrical equipment as specified in 29 CFR, Chapter XVII, Part 1910 (OSHA), NEC, and NFPA 70E, and has all the necessary knowledge for averting danger. There must be written documentation of the training.

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SMA America, LLC 2 Safety

2.3 Personal Protective Equipment

After the control voltage has been switched on, personal protective equipment is required for all work performed. The protective equipment must comply with the requirements of NFPA 70E. The customer must ensure that external measures limit incident energy levels to PPE level 2, in conformance with IEEE1584.

Protective equipment required by legal regulations or otherwise prescribed must be added accordingly.

2.4 Safety Precautions

This section contains safety precautions that must always be observed during work on or with the Sunny Central. To prevent personal injury and property damage, and to ensure long-lasting operation of the Sunny Central, read this section carefully and follow the instructions.

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Electrical Hazards

Electric shock from live voltage

High voltages are present in the inverter and its component parts. Some maintenance work must be done with voltage present. Failure to adhere to the safety messages may lead to severe or lethal injuries due to electric shock.

• Wear class 2 personal protective equipment.

• Always perform work in compliance with the regulations specified in 29 CFR, Chapter XVII, Part 1910 (OSHA), NEC, and NFPA 70E.

• Do not touch any live component parts of the inverter or the medium voltage grid.

• Follow instructions precisely.

• Observe safety messages.

• Before performing a ny work on t he inverter, a lways disconn ect the inverter if voltage does not absolutely need to be present.

• After disconnecting the inverter, wait at least 10 minutes until the inverter's capacitors have discharged completely.

• Before performing work on the inverter, ensure that no voltage is present.

Electric shock caused by ground fault

In a ground fault, plant sections that are supposedly grounded may in fact be live. Failure to adhere to the safety messages may lead to severe or lethal injuries due to electric shock.

• Ensure that no voltage is present before touching.

• Wear personal protective equipment.

Electric shock due to damaged inverter

Operating a damaged inverter can lead to hazardous situations that may result in serious or lethal injuries due to electric shock.

• Operate the inverter only if it is in safe and technically faultless working order.

• Operate the inverter only if there is no visible damage.

• Regularly check for visible damage.

• Make sure that all external safety equipment is freely accessible at all times.

• Make sure that all safety equipment is in good working order.

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Damage to electronic component parts due to electrostatic discharge

Electrostatic discharge can damage or destroy electronic component parts.

• Observe the ESD safety regulations when working on the unit.

• Wear personal protective equipment.

• Discharge the electrostatic charge before touching electronic component parts, for example by touching the door's PE connection.

Environmental Hazards

Danger to life due to blocked escape routes

In hazardous situations, blocked escape routes can lead to serious injury or death.

• An escape route at least 3 ft (915 mm) wide must be available at all times.

• Do not place any objects in the escape route area.

• Remove all tripping hazards from the escape routes.

Damage to the inverter caused by dust or moisture penetration

Dust intrusion or moisture penetration can damage the inverter or impair its functionality.

• Do not open the inverter when it is raining or when humidity exceeds 95%.

• Perform maintenance on the Sunny Central only when the environment is dry and free of dust.

Hazards Due to Human Error

Danger to life due to electric shock when inverter is unlocked

Unlocked inverters can be opened by unauthorized persons. This means that unauthorized persons have access to component parts on which lethal voltages are present.

• Ensure that unauthorized persons have no access to the inverter.

• Always lock the inverter.

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Mechanical Hazards

Risk of fire due to failure to observe torque specifications

Failure to follow the torque specifications indicated in the installation manual reduces the ampacity of the screw connections. This can cause component parts to overheat and catch fire.

• Always use the torques specified in the installation manual.

• Regularly check that mounted components have always been set at the torque specified in the installation manual.

Danger from illegible or missing warning signs

Warning signs on the Sunny Central warn operators about hazardous areas and must always be present and legible.

• Regularly check to be sure that all warning signs are present and undamaged.

• Immediately replace missing, faded, or damaged warning signs.

Thermal Hazards

Risk of burns due to hot component parts

The component parts of the Sunny Central can become very hot. Touching these component parts can lead to burn injuries.

• Do not touch hot component parts.

• Wait until hot component parts have sufficiently cooled down.

• Observe safety messages in the Sunny Central.

• Wear class 2 personal protective equipment.

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3 Product Description

This section will give you an overview of the Sunny Central 500HE-US/CA and its components.

3.1 Design of the Inverter

Figure 1: Design of the inverter

Position Designation

A Inverter cabinet

B Insect screen, air intake area

C Connection cabinet for customer interfaces

D Connection cabinet for AC and DC power cables

E Ventilation grid, air outlet

3.2 User Interface

Figure 2: Display and key switch

Position Designation

ADisplay

BKey switch

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4Maintenance

This section includes all necessary information for performing maintenance work on the Sunny Central.

4.1 Maintenance Intervals

Observance of maintenance intervals ensures trouble-free operation of the Sunny Central. Maintenance intervals depend on ambient and operating conditions. Under especially harsh ambient conditions, certain maintenance tasks must be performed more frequently. These maintenance tasks are listed in the maintenance report. SMA recommends a monthly optical inspection in order to determine the need for maintenance. Under normal ambient and operating conditions, the Sunny Central must be completely serviced at the following intervals:

Maintenance under normal ambient and operating conditions:

Description Interval

Routine maintenance Every 24 months

AC circuit breaker Every 48 months

Surge arrester If tripped

Retighten the power cable connection by using a cage clamp

Unscheduled maintenance After any short circuit

Every 12 months

• Contact the SMA Service Line

Preventative replacement intervals:

Description Interval

GFDI/soft grounding/ABB high-performance circuit breaker

Fan 10 years

Surge arrester

•DEHNguard

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After 100 trippings

• Contact the SMA Service Line

If tripped

• Contact the SMA Service Line

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4.2 Preparing for Maintenance

This section contains the tasks that you always have to do before starting maintenance work.

4.2.1 Identifying the Inverter

The type label provides a clear identification of the Sunny Central. Two type labels are attached to the Sunny Central. The type labels can be found on both the top left side in the connection cabinet and on the right side in the inverter cabinet.

Additionally, the serial number can be found on the roof of the inverter at the top left.

Figure 3: Layout of the type label (example)

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Position Designation Explanation

AModel Device type

B Serial No. Inverter serial number

C Fabrication Date Date of manufacture

D ‒ Device-specific characteristics

4.2.2 Reading Error Messages

Before any maintenance you need to read pending error messages from the inverter. The error me ssa ges may giv e yo u clu es a bou t possible damaged component parts . Th e so urc e of the err or mu st be corrected before scheduled maintenance is started.

1. Read error messages via the display (see Sunny Central user manual).

2. Fix the source of the error (see the Sunny Central user manual). ☑ There are no more error messages.

4.2.3 Performing Visual Inspection

A thorough visual inspection must be performed before any maintenance work. This ensures that Sunny Central component parts are not damaged and also minimizes potentially hazardous situations. Immediately remedy any deficiencies discovered.

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

• Fix any deficiencies discovered during the visual inspection.

Visual inspection means:

• Check the inverter for soiling.

• Check the inverter's enclosure for damage.

• Check component parts inside the inverter for damage and discoloration.

• Check the inverter for loose component parts.

• Check metal components for visible oxidation.

• Check component parts for soot from overheating.

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Fix any deficiencies discovered:

Str

Electric shock from live voltage

High voltages are present in the inverter and its component parts. Failure to heed this safety message can result in severe or lethal injuries due to electric shock.

• Disconnect the inverter before remedying the deficiencies discovered during the visual inspection.

• After disconnecting the inverter, wait at least 10 minutes until the inverter's capacitors have discharged completely.

• Wear personal protective equipment.

•Ensure that no voltage is present.

• Follow instructions precisely.

• Observe safety messages.

4.3 Maintenance under Dead Conditions

This section describes maintenance of the Sunny Central with no voltage present. All actions described below may only be performed with the inverter disconnected.

4.3.1 Disconnecting the Inverter

Electric shock from live voltage

The component parts of the Sunny Central are energized. Touching component parts of the Sunny Central can result in severe injuries or death.

• Before performing any work on the Sunny Central, disconnect the inverter and secure it against being switched back on.

• After disconnecting the inverter, wait at least 10 minutes until the inverter's capacitors have discharged completely.

•Ensure that no voltage is present.

Person authorized to operate the medium-voltage transformer

Only a duly authorized person trained in electrical safety can disconnect and connect the AC voltage of the medium-voltage transformer.

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Figure 4: Position of the miniature circuit-breaker

Position Designation

A Miniature circuit-breaker for the external control voltage

B Miniature circuit-breaker for the internal control voltage

C Miniature circuit-breaker for the voltage meter

1. Set the key switch of the inverter to "Stop."

2. Check whether the DC and AC contactors audibly shut off within 5 seconds or less. If the DC and AC contactors do not audibly shut off within 5 seconds or less, contact the

SMA Service Line.

3. Disconnect the inverter from the DC side of the PV array via the external DC disconnecting device and ensure that it cannot be reconnected.

4. When using the Disconnect Unit: – Disconnect the AC and DC sides using the Disconnect Unit's disconnect switch and ensure

that it cannot be reconnected (see the Disconnect Unit installation manual).

5. Disconnect the inverter on the AC side from the power distribution grid via the external AC disconnecting device and ensure that it cannot be reconnected.

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If there is no AC disconnecting device available, disconnect the AC voltage from the mediumvoltage transformer with the medium-voltage switch and ensure that it cannot be switched on again.

6. Switch off the AC switch-disconnector.

7. Check whether the inverter's display shows 0 V DC voltage. If the inverter's display does not show 0 V DC voltage, contact the SMA Service Line.

8. Check whether the inverter's display shows 0 V AC voltage. If the inverter's display does not show 0 V AC voltage, contact the SMA Service Line.

9. In the case of additional external voltages: – Disconnect additional external voltages and secure them against being switched back on.

10.

Electric shock from live voltage

The component parts of the Sunny Central are energized. Touching component parts of the Sunny Central can result in severe injuries or death.

• After disconnecting the inverter, wait at least 10 minutes until the inverter's capacitors have discharged completely.

11. If external control voltage is used, switch off the miniature circuit-breaker for the external control voltage and secure it against being switched back on.

12. Switch off the miniature circuit-breaker for the internal control voltage and secure it against being switched back on.

13. Switch off the miniature circuit-breaker for the voltage meter and secure it against being switched back on.

14. Ensure that all poles are free of voltage.

15. Ground and short-circuit.

16. Cover or shield any adjacent live components.

☑ The Sunny Central is disconnected.

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4.3.2 Checking Safety Messages

Figure 5: Location of safety messages on device

Position Designation

A Hazardous voltage inside

B Hazardous voltage inside

C Operating the Sunny Central without transformer causes a short circuit and can

destroy the Sunny Central

D Hazardous voltage

EBURN HAZARD

G max. 600 V PV+ / max. 600 V PV −

H Equipment ground

I Do not change settings

K A, B, C, 200 V / 60 Hz

M Risk of electric shock or electrical high-energy current levels

*Optional

Software version identifier

• Disconnecting the inverter (see 4.3.1 "Disconnecting the Inverter", page 19).

• Replace missing or damaged safety messages and stickers. In the case of missing or damaged safety messages or stickers, contact the SMA Service Line.

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4.3.3 Disassembling the Panels

Grounding cables on the kick plates

Grounding cables connect the panels with the inverter.

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

1. Undo the screws on the two front panels.

2. Pull the panels toward the front.

3. Detach the equipment grounding connection between the panel and the connection cabinet.

4. Remove the panels.

4.3.4 Cleaning the Air Baffle

Impaired air circulation increases the internal temperature and can reduce the electrical endurance of temperature-sensitive components.

The cleaning interval for the air baffle is dependent on the ambient conditions.

• Clean the air baffle more frequently in cases where there is high sand or dust content in the air (see maintenance report).

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

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1. Remove th e air b affle from the inv erter cabinet. To do this, grasp under the air baffle and press upward in the middle when removing.

2. Clean the air baffle with a brush and vacuum.

3. Push the air baffle into the inverter cabinet. Here, the ventilation grid in the filter frame has to face the back panel.

☑ The ventilation grid is flush with the inverter

enclosure.

✖ What if the air baffle does not go all the way in?

• Grasp the air baffle from underneath and press upward in the middle while pushing it in.

4.3.5 Cleaning the Air Duct and Insect Screen

Impaired air circulation increases the internal temperature and can reduce the electrical endurance of temperature-sensitive components.

The cleaning interval for the air duct and insect screen is dependent on the ambient conditions.

• Clean the air duct and insect screen more frequently in cases where there is high sand or dust content in the air (see maintenance report).

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

The insect screen is located on the front side of the inverter's roof (see 3.1 "Design of the Inverter", page 15).

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1. Undo the screws on the right-hand insect screen.

2. Pull the bottom of the right-hand insect screen forward. This removes the insect screen.

3. Undo the screws on the left-hand insect screen.

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4. Pull the bottom of the left-hand insect screen forward. This removes the insect screen.

5. Clean the air duct from the outside.

6. Clean the insect screen with a brush.

7. Vacuum the insect screen.

8. Check the insect screen for visible damage. ☑ The insect screens are not damaged. ✖ What if the insect screens are damaged?

• Replace damaged insect screens.

9. Insert the right-hand insect screen.

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10. Screw the right-hand insect screen into place. Torque: 177 in.-lbs. (20 Nm).

11. Insert the left-hand insect screen.

12. Screw the left-hand insect screen into place. Torque: 177 in.-lbs. (20 Nm)

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4.3.6 Cleaning the Inside of the Switch Cabinet

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

1. Remove dirt and dust from the interior of the switch cabinet and from all assemblies, (e.g. DC contactor and AC circuit breaker).

2. Remove moisture.

3. Check for leaks. Correct as necessary.

4.3.7 Cleaning the Heating Elements of the Low-Temperature Area Option (Optional)

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

Figure 6: Heating element locations

1. Disassemble the protective covers.

2. Remove dirt and dust from the heating elements with a cleaning cloth.

3. Remove moisture with a cleaning cloth.

4. Mount the protective covers.

4.3.8 Checking the DC Main Fuses

Damage to screw connections from over-tightening

• Only tighten loose screw connections with the prescribed torque. Torque specifications are shown in the inverter's circuit diagram. Contact the SMA Service Line if specifications are missing.

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Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

1. Remove the plexiglass covers.

2. Check fuses, terminals, and insulation for discoloration or changes. When checking, do not remove the fuses.

If the fuses, terminals, or insulation are discolored or changed, contact the SMA Service Line.

3. Check whether the mark on the screw connections of the fuses is in the right place.

If the mark on the screw connections is not in the right place, retighten the screw connection (see the inverter's circuit diagram for the torque specification). Contact the SMA Service Line in the event of damage or changes.

4. Check whether discolorations can be seen on the screw connections of the fuses. If discolorations can be seen on the screw connections, contact the SMA Service Line.

4.3.9 Checking the Surge Arresters (Optional)

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

Figure 7: Surge arrester

Position Designation

AReady indicator

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• Check whether the surge arrester's ready indicator is red. If the surge arrester's ready indicator is red, replace the surge arrester. – Remove the cable. Mark the cable in the process. It must be connected to the same terminal

again later.

– Depress the lever and lift the surge arrester

upward out of the top-hat rail.

– Insert the new surge arrester into the top-hat rail

from above and press it against the top-hat rail.

– Connect the cable to the terminal from which you removed it before.

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4.3.10 Checking the Connection of the Power Cables Using Terminal Lugs (Optional)

Damage to screw connections from over-tightening

• Only tighten loose screw connections with the prescribed torque. Torque specifications are shown in the installation manual of the inverter. Contact the SMA Service Line if specifications are missing.

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

Figure 8: Position of the power cables in the terminal lug option

Position Designation

A For negative grounding: DC −

For positive grounding: DC+

B For positive grounding: DC −

For negative grounding: DC+

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Position Designation

C AC connection

DProtective conductor

1. Check whether all screw connections for the power cables are tight. If screw connections are loose, tighten them with a torque wrench.

2. Check insulation and connections for discoloration or changes. If insulation and connections are discolored or changed, contact the SMA Service Line.

3. Check screw connections for damage and contact elements for corrosion. If screw connections are damaged or contact elements are corroded, contact the

SMA Service Line.

4.3.11 Retightening the Connection of the Power Cables Using Cage Clamps (Optional)

Damage to screw connections from over-tightening

• Only apply the prescribed torque to tighten screw connections with the cage clamp option. Torque specifications are shown in the inverter installation manual. Contact the SMA Service Line if specifications are missing.

Inadequate screw connections due to harsh ambient conditions

• Check the screw connections for discoloration or changes more frequently in the case of significant daytime temperature differences (see maintenance report).

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

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Figure 9: Position of screw connections with cage clamp option

Position Designation

A For negative grounding: DC −

For positive grounding: DC+

B For positive grounding: DC −

For negative grounding: DC+

C AC connection

DProtective conductor

1. Disassemble the protective covers.

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2. Tighten the screw connections with cage clamps using a torque wrench. Torque 500 in-lbs (56.5 Nm).

3. Check insulation and connections for discoloration or changes. If insulation and connections are discolored or changed, contact the SMA Service Line.

4. Check screw connections for damage and contact elements for corrosion. If screw connections are damaged or contact elements are corroded, contact the

SMA Service Line.

5. Mount the protective covers.

4.3.12 Checking the Seals on Doors

Figure 10: Seals on doors

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Position Designation

A Seal

B Surfaces under pressure

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

Required maintenance material (not included in the scope of delivery):

☐ A suitable water-free, heat-resistant lubricant, e.g. WD40.

1. Check whether seals in the area of surfaces under pressure show any damage. Tip: the area of surfaces under pressure cannot be distinguished when the door is closed.

If seals are damaged, contact the SMA Service Line.

2. Maintain seals with talcum, Vaseline or wax. This prevents frost damage.

3. If the side panels were removed: check whether seals on the side panels show damage in the area of surfaces under pressure.

If seals are damaged, contact the SMA Service Line.

4.3.13 Checking Locking Devices, Door Stops, and Hinges

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

Required maintenance material (not included in the scope of delivery):

☐ A suitable water-free, heat-resistant lubricant, e.g. WD40. ☐ Non-greasy antifreeze, e.g. PS88.

1. Check whether the latching action is smooth. Open and shut the doors several times in the process.

If the doors do not latch easily, apply lubricant to all moving parts of the latch.

2. Check whether the doors stay closed. If the doors do not stay closed, apply lubricant to the door stops.

3. Check whether the door hinges move easily. If the door hinges do not move easily, apply lubricant.

4. Lubricate all moving latch elements and movement points.

5. If the inverter is located in a region where temperatures fall below freezing, protect the profile cylinder of the door lock and the key switch from icing over with non-greasy antifreeze.

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4.3.14 Checking the Surface of the Switch Cabinet

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

• Check whether the surfaces are damaged. If the surfaces are damaged, perform repairs immediately, within 3 weeks at the latest. If surfaces are corroded, perform repairs immediately, within 3 weeks at the latest.

4.3.15 Checking the Switch Cabinet for Corrosion

Requirement:

☐ The inverter must be disconnected (see 4.3.1 "Disconnecting the Inverter", page 19).

Required Material:

☐ For small-scale repairs, use a touch-up stick, brush, spray paint, or 2K-PUR acrylic paint in the

corresponding RAL color. Note the paint manufacturer's instructions.

☐ For repairs of extensive damage, use repair paint or 2K-PUR acrylic paint in the corresponding

RAL color. Note the paint manufacturer's instructions.

Position RAL color Article number

Enclosure RAL 9016 87-5051310

Roof RAL 7004 87-5051311

Base RAL 7005 87-5051312

☐ Abrasive cloth ☐ Degreaser

1. Remove dirt.

2. For small-scale damage, treat the affected area as follows:

• Scour the surface.

• Clean the surface with degreaser.

• Paint the surface.

3. For extensive damage, treat the entire area as follows:

• Scour the surface.

• Clean the surface with degreaser.

• Paint the entire surface.

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4.4 Performing Maintenance Work on Inverters with Activated Control Voltage

This section describes maintenance of the Sunny Central when the control voltage is switched on. The inverter's component parts are energized. During the maintenance tasks described in this section it may be necessary to turn the inverter off and then back on several times.

4.4.1 Connecting the Control Voltage

Str

Electric shock from live voltage

High voltages are present in the inverter and its component parts. Failure to heed this safety message can result in severe or lethal injuries due to electric shock.

• Wear personal protective equipment.

• Follow instructions precisely.

• Observe safety messages.

Figure 11: Position of the miniature circuit-breaker

Position Designation

A Miniature circuit-breaker for the external control voltage

B Miniature circuit-breaker for the internal control voltage

C Miniature circuit-breaker for the voltage meter

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1. Open the doors of the connection cabinet.

2. If external control voltage is used, switch on the miniature circuit-breaker for the external control voltage.

3. Switch on the miniature circuit-breaker for the internal control voltage.

4. Switch on the miniature circuit-breaker for the voltage meter.

4.4.2 Checking the AC Circuit Breaker

Additional required test material (not included in the scope of delivery):

☐ Communication Unit BT030

Communication Unit BT030

Maintenance of the AC circuit breaker must be performed with the external Communication Unit BT030. Die Communication Unit can be connected to the AC circuit breaker during maintenance. If Communication Unit BT030 is not on hand, it can be ordered from SMA under item number 60-1620.

• Check the AC circuit breaker as described in the separate maintenance manual.

4.4.3 Checking Heating Elements, Fans and Hygrostat

Risk of burns due to the heating element's hot surfaces

During the functional test, the heating element becomes hot. There is a risk of burns if you touch the heating element without protective gloves.

• Do not touch heating elements with bare hands.

• Wear personal protective equipment.

• Always check the function of heating elements from an adequately safe distance.

Low air humidity

If the air humidity is below 50%, you will not be able to perform the function test, as the minimum value of the hygrostat is 50%.

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Figure 12: Location of the heating element, hygrostat and fan.

Position Designation

A Fan

BHygrostat

CHeating element

Requirement:

☐ Control voltage is present. ☐ There are no problems.

1. Switch the Sunny Central to "Stop."

2. Open the doors of the connection cabinet.

3. Disassemble the heating element's protective cover.

4. Adjust the hygrostat in the connection cabinet to the minimum value so that the heating element switches on. Tip: the hygrostat is adjusted correctly if the relay clicks audibly.

5. Check whether the heating element begins to radiate heat after approximately 5 minutes. If the heating element is not switched on, contact the SMA Service Line.

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6. Check whether the fans are starting to run. The fans rotate at low speeds. If the fans do not start running, contact the SMA Service Line.

7. Tu rn t he h ygro sta t in the con nec tion cab ine t ba ck t o 80 %. T IP: the hyg ros tat is s et c orr ect ly w hen the white bar on the hygrostat's regulator is horizontal.

8. Mount the heating element's protective cover.

9. Close the doors of the connection cabinet.

4.4.4 Checking the Heating Elements of the Low-Temperature Area Option (Optional)

Risk of burns due to the heating element's hot surfaces

During the functional test, the heating element becomes hot. There is a risk of burns if you touch the heating element without protective gloves.

• Do not touch heating elements with bare hands.

• Wear personal protective equipment.

• Always check the function of heating elements from an adequately safe distance.

Requirements:

☐ Control voltage is present. ☐ There are no problems.

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Figure 13: Position of the low-temperature option controls

Position Designation

A Heating elements of the low-temperature option

B Terminal plug for heating control

C Heating elements of the low-temperature option

1. Switch the Sunny Central to "Stop."

2. Open the doors of the connection cabinet.

3. Open the doors of the inverter cabinet.

4. Disassemble the protective covers.

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5. Pull out the terminal plug for the heating control.

☑ A contactor audibly switches off the inverter. After about 2 minutes, another contactor

audibly switches off the control voltage.

✖ What if the switching of the contactors is not audible?

• Contact the SMA Service Line.

6. Check whether the heating elements radiate heat after a delay time of 5 minutes. If the heating element does not radiate heat, contact the SMA Service Line.

7. Insert the terminal plug for the heating control. ☑ A contactor audibly switches on the control

voltage. After about 2 minutes, another contactor audibly switches on the inverter.

✖ What if the switching of the contactors is not

audible?

• Contact the SMA Service Line.

8. Mount the protective covers.

9. Close the doors of the connection cabinet.

10. Close the doors of the inverter cabinet.

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4.5 Mounting the Panels

1. Check that no animals have entered the base area.

2. Attach the plexiglass cover.

3. Fasten the connection cabinet grounding cable to the panels with screws. Torque: 70 ⅘ in.-lbs. (8 Nm).

4. Check that the grounding cables are correctly mounted.

5. Screw on the panels.

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5 Contact SMA America, LLC

5Contact

If you encounter technical problems with our products, contact the SMA Service Line. We require the following data in order to provide you with the necessary assistance:

• Device type

•Serial number

• Fabrication version

• Installation address with GPS coordinates

•Plant name

• Photos of defective components

• Type and number of the PV modules connected

SMA Solar Technology America, LLC

6020 West Oaks Blvd, Ste 300 Rocklin, CA 95765 Tel. +1 916 625 0870 Tel. +1 877-MY SMA TECH Tel. +1 877 697 6283 (Toll free, available for USA, Canada and Puerto Rico) Fax +1 916 625 0871 Service@SMA-America.com www.SMA-America.com

SMA Solar Technology Canada Inc.

2425 Matheson Blvd. E, 8th Floor Mississauga, ON L4W 5K5 Canadá Tel. +1 877 506 1756 (Toll free, available for Canada) Service@SMA-Canada.ca www.SMA-Canada.ca

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